Terry,
Does your trampoline have lacing down the middle and across the back? If so, you could do the same thing we have done with Hobie Waves when the hiking straps wear out. We run a hiking strap diagonally from somewhere in the center lacing back and outboard to the back lacing (if you don't have back lacing, you could tie it to an eye-strap at the outer end of the aft beam. A lot of people seem to prefer the diagonal strap.

You can do it a number of ways -- you can use a piece of webbing, double it over at each end and put a grommet through at each end of the webbing and put a line through the grommet at each end to tie to the lacings (or beam if no lacing in the back). Or you can use line all the way and sleeve over it some plastic tubing. Or you can get some of that nice, cushy black foam tubing I have seen on dinghies (Rick likes that because it is so easy to slide your foot under it) and it is more comfortable on your feet.

If you have a crew, you could do the same thing, in reverse, going diagonally from the center lacing and forward with a hiking strap for the crew, although I rarely used the forward hiking strap in my many years of crewing except in moderately heavy air downwind. And in really heavy air I was at the back of the boat and hanging onto the aft hiking strap anyway.